apiVersion: v1
kind: ServiceAccount
metadata:
  name: coredns
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:coredns
rules:
  - apiGroups:
    - ""
    resources:
    - endpoints
    - services
    - pods
    - namespaces
    verbs:
    - list
    - watch
  - apiGroups:
    - discovery.k8s.io
    resources:
    - endpointslices
    verbs:
    - list
    - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
  name: system:coredns
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:coredns
subjects:
- kind: ServiceAccount
  name: coredns
  namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns
  namespace: kube-system
data:
  Corefile: |
    .:53 {
        errors
        health {
          lameduck 5s
        }
        kubernetes cluster.local in-addr.arpa ip6.arpa {
          pods verified
          fallthrough in-addr.arpa ip6.arpa
          ttl 30
        }
        prometheus 0.0.0.0:9153
        forward . /etc/resolv.conf {
          max_concurrent 1000
        }
        cache 30
        loop
        reload
        loadbalance
    }
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/name: "CoreDNS"
spec:
  selector:
    matchLabels:
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        k8s-app: kube-dns
    spec:
      priorityClassName: system-cluster-critical
      serviceAccountName: coredns
      tolerations:
        - key: node-role.kubernetes.io/master
          operator: Exists
          effect: NoSchedule
      nodeSelector:
        kubernetes.io/os: linux
        node-role.kubernetes.io/master: ''
        node-role.kubernetes.io/control-plane: ''
      affinity:
         podAntiAffinity:
           requiredDuringSchedulingIgnoredDuringExecution:
           - labelSelector:
               matchExpressions:
               - key: k8s-app
                 operator: In
                 values: ["kube-dns"]
             topologyKey: kubernetes.io/hostname
      containers:
      - name: coredns
        image: {{ REGISTRY_URL | default('https://docker.io') | urlsplit('hostname') }}{% if REGISTRY_URL | default('https://docker.io') | urlsplit('port') is not none %}:{{REGISTRY_URL | default('https://docker.io') | urlsplit('port')}}{% endif %}{% if REGISTRY_URL | default('https://docker.io') | urlsplit('path') is not none %}{{ REGISTRY_URL | default('https://docker.io') | urlsplit('path') }}{% endif %}/coredns/coredns:v1.10.1
        imagePullPolicy: IfNotPresent
        resources:
          limits:
            memory: 170Mi
          requests:
            cpu: 100m
            memory: 70Mi
        args: [ "-conf", "/etc/coredns/Corefile" ]
        volumeMounts:
        - name: config-volume
          mountPath: /etc/coredns
          readOnly: true
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        - containerPort: 9153
          name: metrics
          protocol: TCP
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            add:
            - NET_BIND_SERVICE
            drop:
            - all
          readOnlyRootFilesystem: true
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 5
      dnsPolicy: Default
      volumes:
        - name: config-volume
          configMap:
            name: coredns
            items:
            - key: Corefile
              path: Corefile
---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    kubernetes.io/name: "CoreDNS"
spec:
  selector:
    k8s-app: kube-dns
{% if (networking.podSubnet.split(',') | length == 2) and (networking.serviceSubnet.split(',') | length == 2) %}
  ipFamilyPolicy: PreferDualStack
{% if networking.serviceSubnet.split(',')[0] | default('10.96.0.0/12') | ansible.utils.next_nth_usable(2) | ip == 4 %}
  ipFamilies:
    - IPv4
    - IPv6
  clusterIP: {{ networking.serviceSubnet.split(',')[0] | ansible.utils.next_nth_usable(2) }}
  clusterIPs:
  - {{ networking.serviceSubnet.split(',')[0] | ansible.utils.next_nth_usable(2) }}
  - {{ networking.serviceSubnet.split(',')[1] | ansible.utils.next_nth_usable(2) }}
{% else %}
  ipFamilies:
    - IPv6
    - IPv4
  clusterIP: {{ networking.serviceSubnet.split(',')[1] | ansible.utils.next_nth_usable(2) }}
  clusterIPs:
  - {{ networking.serviceSubnet.split(',')[1] | ansible.utils.next_nth_usable(2) }}
  - {{ networking.serviceSubnet.split(',')[0] | ansible.utils.next_nth_usable(2) }}
{% endif %}
{% else %}
  clusterIP: {{ networking.serviceSubnet | default('10.96.0.0/12') | ansible.utils.next_nth_usable(2) }}
{% endif %}
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP
  - name: metrics
    port: 9153
    protocol: TCP
